Off-white, cream, or grayish-white tin enamel, usually covering both sides of the vessel. The quality of the enamel varies widely among vessels, from thin, irregular and shiny, to thick, matte and smooth.

Isabela Polychrome is part of the "Morisco" (Christianized Muslim) ceramic tradition of fifteenth century southwestern Spain, centered around Seville. It is the only polychrome majolica in that group, and declined in frequency around 1550 on American sites.